Automatic regulator for smoke-preventing devices.



No. 679,455. Patented luly 30, |90l. w. .1. cnn-1mm. AUTUIATIG REGULATOR FUR SMOKE P-REVENTING DEVICES.

. (Appumion ma Apr. 24, 1901.) (No Model.) 2 Shoah-Sheet I.

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AUTDIATIC BEGULATUR FOB SMOKE lPREVEII'I'IIIB DEVICES.

(Application mea Apr. 24, 1901.) (No Model.) 2 Shouts-Shut 2.

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ilomqu UNITED STATES PATENT OFFICE.

WILLIAM J. CREELMAN, OF ROCHESTER, NEW YORK, ASSIGNOR TO THE GENERAL MANUFACTURING COMPANY, OF SAME PLACE.

AUTOMATIC REGULATOR FOR SMOKE-PREVENTING DEVICES.

SPECIFICATION forming part of Letters Patent No. 679,455, dated July 30, 1901.

Application filed April 24, 1901. Serial No. 57,170-l (No model.)

To all whom, t may concern.-

Be it known that I, WILLIAM J. CREELMAN, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Automatic Regulators for Smoke-Preventing Devices, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same- The object of my invention is to provide a compact, efficient, and durable structure in a smoke-preventing device in which additional steam or air, or both, is automatically supplied to the hre-space at the time of adding fresh fuel and for a limited period thereafter,which device may be readily and cheaply installed in connection with various types of furnaces. I attain this object by the construction illustrated in the accompanying drawings, in which* Figure l is an end elevation of the fire-front of the furnace with my improved smoke-preventer in position. Fig. 2 is a detail, partly in elevation and partly in section, of the steam-supply pipe, frame-plate, and dash-pot embodied in my invention. Fig. 3 is a section taken on line :c of Fig. 2. Fig. l is a side elevation of the parts shown in Fig. 2 looking from the right. Fig. 5 is a detail, partly in section, showing the interior of the main valve in the steam-pipe. Fig. 6 is a sectional detail of the device for adjusting the size of the orifice in the by-pass pipe. Fig. 7 is an end elevation of the parts shown in Fig. 6 looking from the left. Fig. 8 is a section, on a larger scale, of a modification wherein the by-pass orifice, with adjusting means like that shown in Fig. 6, is situated directly in the piston-head. The check-valves are omitted in this View.

Similar characters refer to similar parts throughout the several views.

A designates the fire-front of a furnace of ordinary construction, wherein B B are the firing-doors. In passages a a in the doors B are journaled on trunnions or otherwise supplementary doors C C, acting as draftdoors for supplying additional air to the lirebed of the furnace at certain times, as will be explained more fully hereinafter.

D is a steam-supply pipe leading from the boiler or dome to nozzles or sprays, (indicated in dotted lines at z, Fig. 1.) An ordinary cock E and a valve F, which may be of any desired construction, but which is shown in Fig. 5 as of an ordinary type of swinging valve having a valve-head rocking upon a spindle f,control the passage of steam through pipe D.

To a lug or arm 1, rigidly attached to one of the doors B, is connected chain 2, which leads over idlers 3 3 3, supported from the fire-front, and is fastened at its other end to rod 5, having a vertically-reciprocating movement in bearings 6 6. Said bearings are supported by arms projecting from the casting 7. The casting 7 is adapted to be attached by screws, as shown in Fig. 3, or otherwise to the casting or plate 8, which forms the main frame-plate for supporting the various parts of my improved construction and which is primarily secured t0 the fire-front in installing the machine. Said plate 8 comprises a main flat rectangular portion, a side offset sleeve or bearing 9, through which a vertical section of the steam-pipe D passes, and a lower offset sleeve or bearing 10 for supporting the lower horizontal part of the steampipe, and a substantially disk-shaped part ll, upwardly flanged, as at l2, projecting outwardly at right angles from the main plate, the flange of which is interiorly threaded and adapted to serve as the lower head or cap of a dash-pot, the cylinder 13 of which is exteriorly screw-threaded at its lower end for engagement with the interiorly threaded flange l2 and at its upper end for engagement with the cap or head 14. Piston-head 15 carries check or one-wayvalves 16 16. Attached to the top of the piston-rod 17 is a weight 18, which may be adjustable thereon by means of a set-screw, as shown, or integral therewith and which is cut out or recessed, as at 19, so that it mayin its lowermost position fit closely around the cap 20, which surrounds the piston-rod and acts as a stuffing-box for said piston-rod where it passes through the head of the cylinder. The eect of this is to locate the bulk of the weight as near as possible to the head of the cylinder and to obtain a maximum of efficiency in small space. To collar IOO 21, rigidly connected to the weight 18, is ati end of its cylinder, and therebyrhold valve F tached the .upper end of rod 5 either by reducing the end of said rod, thereby forming a shoulder, as at 22, between which and the nut 23 on the end of the rod the collar 21 rests, or in any other desired manner. connected at one end to the spindle f of the steam-supply valve F and at its other end is connected to thelweight, which is rigid with thepiston-rod 17, so that the valve is rocked to and from its seat as the piston-rod reciprocates. In order that the parts may work easily, there should be a certain yamount of play between the piston-rod and lever,which is provided for in this case by the elongated slot 25 in the end of said lever, through which passes the screw 26. By-pass pipe 27, which is assembled with threaded sections, connectingjoints 28 28, and adjusting-coupling 29, connects the lower end of cylinder 18 with the upper end, as is fully shown in the drawings. A right-angled connecting joint or coupling (designated in a general way by H) connects the two sections of this by-pass pipe, shown herein as at the joint between the vertical section and a lower horizontal section, although this .position is not material. The nature of this connection is clearly shown in Figs. 6 and 7, wherein the by-pass orifice 30 in said coupling is adapted to be wholly or partially closed'hy the shank 3l offan adjusting screw orplug 32, threaded at one end, as shown, where it 'passes through a threaded bearing 33 in the side of thecoupling and at the other endcut-away on intersecting planes, so as to form a tapering V-shaped cut-out, largest at the end and .gradually decreasing in size toward the middle of the plug, as shown. It is readily seen Vthat with this construction by turning the yplug one way or the other in its bearing the orifice 30 may be wholly or partially stoppedvby said plug andthe amount of said orifice left for free passage of fluid may be veryr delicately adjusted. 'A thumbnut 34 is provided for locking the plugin any desired position.

Fastened to the lower end of the guide-rod vvis 'a chain 35, which passes over sheave 37,

rigid with rock-shaft 38, extending across the hre-front and supported in bearings thereon. To ysheaves 39 89, rigid with said rockshaft and-which may be eccentric to the axis thereof in order to give quicker motion,'are attached chains 40 40, which are attached at their other ends to supplementary doors C C, before mentioned. The spring 41, fastened tothe support which'carries the upper idler Sand to the chain 2 at any desired point, prevents said chain from slipping off the lower ridler when the door is closed and before the slack of the chain is taken up by the return movement of the piston.v

The operation will be readily apparent from the above description of features of construction. The cylinder of the dash-pot is filled with oil or other fluid, and the weight causes the piston-head to rest normally at the lower Lever 24 is closed. When the fire-doors are opened for the purpose of supplying fuel, the pull upon chain 2 raises the rod 5, and with it the Weighted piston-rod 17. As the piston is raised the oil in the cylinder passes through the checkvalves to the lower end of the cylinder. At the same time through lever 24 the steamsupply valve is opened and steam is forced over the fire, or it may be steam and air, depending upon the construction of the nozzles, which may act likewise as air-injectors in a manner well known'in the art. As rod 5 is raised shaft 38 is rocked th rough chain 35. Supplementary doors C C are opened by chains 40 40, and air passes through said supplementary doors to the firegrate. Then as the oil isvgradually forced by the pressure of the weighted piston-rod through by-pass pipe 27 to the upper end of the dash-pot cylinder the steam-supply valve, which is connected to be operated by the piston-rod, is gradually closed until the parts return to their normal position. The orifice n (shown in Fig. 5) is constantly open for the passage of a small supply of steam, whereby the accumulation of water of condensation in the steam-pipe is prevented. It will be readily seen that by the adjustment of the plug 31 in the by-pass pipe the time during which additional steam and air are supplied to the fire may be easily and accurately predetermined. The rigid connection between the piston-rod and the guide-rod, which is it-self limited byits fixed bearings to a right-line movement, steadies said piston-rod, gives it freedom and precision of movement, prevents friction and buckling of parts, and insures the clean-cut movement of the valve-operating devices which is essential in machines of this type.

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The plates 7 and 8, which are for convenience spoken of as castings, may be made in any desired way, and they may be made separately, as shown, or formed in one piece.

For convenience in assembling, however, the form shown -is preferred, as well as the sectional construction of steam-supply and bypass pipes. It is obvious that the chain from the fire-door might be attached directly to the weight at the end of the piston-rod rather IIO than to the guide rod and that various changes in minor details may be made without departing from the spirit of my invention. For instance, the nu mberof cam-shafts upon the rock-shaft 38 and the number of supplementary doors connected to be actuated thereby is immaterial, as is the number and position of the bearings 6, so long as they are sufficient to accomplish the desired result.

Fig. 8. shows a modification, wherein instead of an outside by-pass pipe the by-pass for allowing the piston to drop slowly to the bottom of the vcylinder is in the center of the piston-head. In this case the piston-rod L is hollow and partially closed at its lower end,

where it ypasses through the piston-head by r washer 41. The check-valves are omitted in this view, inasmuch as their function is the same as before. A passage-way from the lower side of the cylinder to the upper is provided through the hollow piston-rod, the center of the washer 4l, and side eXits or pas sages 42. The passage in the center of washer 4l is adapted to be wholly or partially closed by the adj usting-plug 48, which is cut away where it passes through said washer in the same manner and for the same purpose as is the plug described in Fig. 6. This plug at the upper end of the piston-rod is threaded for engagement with a cap 44, fitting over the end of the piston-rod, and is notched at its upper end and provided with a lock-nut, as shown, for purposes of adjusting and locking said plug in any desired position and regulating the sizeof the by-pass orifice.

Having described my invention, what I claim as new is I. In an automatic smoke-preventing attachment for furnaces, dmc., in combination, a steam-pipe terminating in jets situated to discharge in proximity to the fire-space, a valve in said pipe, a dashpot, a weight carried by the piston-rod thereof, a lever attached to said weight and controlling said valve, a guide-rod rigidly attached to said weight'and limited to a right-line motion parallel with said piston-rod, and connections between said guiderod and the fire-door of the furnace whereby movement of said door actuates the guide-rod.

2. In a valve-controller for a smoke-preventing device, the combination, substantially as set forth, of a steam-supply valve, a dash-pot having aweighted piston-rod, an actuating-lever for such steam-supply valve connected directly with said piston-rod, a guide-rod attached to the piston-rod, and bearings for said guide-rod attached to the fire-front of the furnace whereby a right=line movement of said guide-rod and piston-rod is secured, and connections whereby upon the opening of the fire-door of the furnace the piston-rod is raised.

3. In an automatic regulator for a smokepreventing device, in combination, a steamsupply pipe, a valve in said pipe, a lever for opening and closing said valve, a dash-pot having a weighted piston-rod to which said lever is connected, a guide-rod connected with said piston-rod and held by fixed bearings to a right-line movement, connections from one end of said guide-rod to the firedoor whereby said rod is actuated by the movement of said iire-door, a supplementary draft-door in the fire-door of the furnace, and connections from the other end of said guiderod to said supplementary door whereby the supplementary door is opened as the guiderod is moved, substantially as described.

4. In combination, a cylinder, apiston-head carrying a one-way valve, a piston-rod, a cap upon the cylinder surrounding said pistonrod, an adjustable weight at the end of said piston-rod having a recess in its lower part to iit around said cap, a guide-rod moving with said piston-rod and passing through fixed bearings whereby a right-line motion of parts is secured.

5. In an automatic regulator for a smoke` preventing device, the combination, of a steam-supply pipe, a steam-supply valve in a vertical section of said pipe, a dash-pot device adjacent to said vertical section of pipe comprising a cylinder, a piston-head having a one-way valve, a 'by-pass and a weighted piston-rod moving parallel to the said vertical steam-pipe, a lever connected at one end to open and close the steam-supply valve and connected at its other end directly to the piston-rod; and a supplementary rod having a rigid connection with said piston-rod and held to a vertical movement whereby the movement of said piston-rod is steadied and the free movement of all the connecting parts is obtained.

6. In a device of the character described, a plate adapted to be attached to the fire-front of a furnace, said plate carrying a vertical sleeve or bearing, a horizontal sleeve or bearing, and a disk-shaped support adapted i0 serve as the head of a dash-pot cylinder.

7. In a device of the character described, an integral plate adapted to be attached to the fire-front of a furnace, said plate comprising a side offset vertical sleeve or bearing, a lower offset horizontal sleeve or bearing, and an outwardly-projecting, substantially disk-shaped part, upwardly flanged to serve as the lower head of a dash-pot cylinder, substantially as and for the purposes set forth.

8. In a device of the character described, a plate adapted to be attached to the iireefront of a furnace, said plate carrying a bearing 0r bearings for supporting and guiding the steam-supply pipes, and a disk-shaped support adapted to serve as the head of a dashpot cylinder, substantially as and for the purposes set forth.

In testimony whereof I affix my signature in the presence of two witnesses.

WILLIAM J. CREELMAN.

Witnesses:

SAMUEL B. WILLIAMS, GEORGE B. WILLIAMS.

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